Authen::SASL::Perl::DIGEST_MD5 versions before 2.2100 for Perl accept replayed authentication responses via unverified nonce in server_step. server_start generates a fresh nonce and sends it in the challenge, and nothing later compares that value against the nonce the client returns. server_step derives the expected digest from the client's own parameters, so a response verifies whenever its digest matches the nonce it carries. The count table it also checks is keyed on the client-supplied nonce and starts empty in each new server object, so a captured first response, carrying `nc=00000001`, passes that too. RFC 2831 defines the nonce in the response as the value the server sent in the preceding challenge. An attacker who observes one successful `qop=auth` exchange can replay the captured response against a later session for the same service, host, realm and user, and authenticate as that user without knowing the password.

The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS host has a package installed that is affected by a vulnerability as referenced in the USN-8858-1 advisory.

    It was discovered that Authen::SASL, a Perl authentication library, did not properly validate login     attempts. An attacker could possibly use this issue to gain unauthorized access.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES16 / SLES_SAP16 host has a package installed that is affected by a vulnerability as referenced in the SUSE-SU-2026:23913-1 advisory.

    This update for perl-Authen-SASL fixes the following issue:

    - CVE-2026-86219: replayed authentication responses accepted due to unverified nonce in `server_step`     (bsc#1279806).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of perl-Authen-SASL installed on the remote host is prior to 2.15-10. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3923 advisory.

    Authen::SASL::Perl::DIGEST_MD5 versions before 2.2100 for Perl accept replayed authentication responses     via unverified nonce in server_step.

    server_start generates a fresh nonce and sends it in the challenge, and nothing later compares that value     against the nonce the client returns. server_step derives the expected digest from the client's own     parameters, so a response verifies whenever its digest matches the nonce it carries. The count table it     also checks is keyed on the client-supplied nonce and starts empty in each new server object, so a     captured first response, carrying `nc=00000001`, passes that too. RFC 2831 defines the nonce in the     response as the value the server sent in the preceding challenge.

    An attacker who observes one successful `qop=auth` exchange can replay the captured response against a     later session for the same service, host, realm and user, and authenticate as that user without knowing     the password. (CVE-2026-86219)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 023a3d0c-b987-11f1-ad2b-40b034429ecf advisory.

    Authen-SASL project reports:
    Authen::SASL::Perl::DIGEST_MD5 versions before                2.2100 for Perl accept replayed authentication                responses via unverified nonce in server_step.
               server_start generates a fresh nonce and sends it                in the challenge, and nothing later compares that                value against the nonce the client returns.
               server_step derives the expected digest from the                client's own parameters, so a response verifies                whenever its digest matches the nonce it carries.
               The count table it also checks is keyed on the                client-supplied nonce and starts empty in each new                server object, so a captured first response,                carrying `nc=00000001`, passes that too. RFC 2831                defines the nonce in the response as the value the                server sent in the preceding challenge. An                attacker who observes one successful `qop=auth`                exchange can replay the captured response against                a later session for the same service, host, realm                and user, and authenticate as that user without                knowing the password.

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote openSUSE 16 host has a package installed that is affected by a vulnerability as referenced in the openSUSE- SU-2026:21946-1 advisory.

    This update for perl-Authen-SASL fixes the following issue:

    - CVE-2026-86219: replayed authentication responses accepted due to unverified nonce in `server_step`     (bsc#1279806).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has a package installed that is affected by a vulnerability as referenced in the SUSE-SU-2026:4302-1 advisory.

    This update for perl-Authen-SASL fixes the following issue:

    - CVE-2026-86219: replayed authentication responses accepted due to unverified nonce in `server_step`     (bsc#1279806).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 / SLES_SAP12 host has a package installed that is affected by a vulnerability as referenced in the SUSE-SU-2026:4280-1 advisory.

    This update for perl-Authen-SASL fixes the following issue:

    - CVE-2026-86219: replayed authentication responses accepted due to unverified nonce in `server_step`     (bsc#1279806).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 44 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-53e2875c88 advisory.

     2.2100 - CVE-2026-86219: Replay attack in Authen::SASL::Perl::DIGEST_MD5 Thanks to TIMLEGGE (@timlegge)     and the CPANSec team for the AI-assisted detection and fix!



Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 45 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-81cd7d0f41 advisory.

     2.2100 - CVE-2026-86219: Replay attack in Authen::SASL::Perl::DIGEST_MD5 Thanks to TIMLEGGE (@timlegge)     and the CPANSec team for the AI-assisted detection and fix!



Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Authen::SASL::Perl::DIGEST_MD5 versions before 2.2100 for Perl accept replayed authentication responses     via unverified nonce in server_step. server_start generates a fresh nonce and sends it in the challenge,     and nothing later compares that value against the nonce the client returns. server_step derives the     expected digest from the client's own parameters, so a response verifies whenever its digest matches the     nonce it carries. The count table it also checks is keyed on the client-supplied nonce and starts empty in     each new server object, so a captured first response, carrying `nc=00000001`, passes that too. RFC 2831     defines the nonce in the response as the value the server sent in the preceding challenge. An attacker who     observes one successful `qop=auth` exchange can replay the captured response against a later session for     the same service, host, realm and user, and authenticate as that user without knowing the password.
    (CVE-2026-86219)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
358448	Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : Authen::SASL vulnerability (USN-8858-1)	Nessus	Ubuntu Local Security Checks	Local	critical
351405	SUSE SLES16 Security Update : perl-Authen-SASL (SUSE-SU-2026:23913-1)	Nessus	SuSE Local Security Checks	Local	critical
351078	Amazon Linux 2 : perl-Authen-SASL (ALAS-2026-3923)	Nessus	Amazon Linux Local Security Checks	Local	critical
350787	FreeBSD : p5-Authen-SASL -- Replay attack in Authen::SASL::Perl::DIGEST_MD5 (023a3d0c-b987-11f1-ad2b-40b034429ecf)	Nessus	FreeBSD Local Security Checks	Local	critical
350770	openSUSE 16 Security Update : perl-Authen-SASL (openSUSE-SU-2026:21946-1)	Nessus	SuSE Local Security Checks	Local	critical
349611	SUSE SLED15 / SLES15 Security Update : perl-Authen-SASL (SUSE-SU-2026:4302-1)	Nessus	SuSE Local Security Checks	Local	critical
349187	SUSE SLES12 Security Update : perl-Authen-SASL (SUSE-SU-2026:4280-1)	Nessus	SuSE Local Security Checks	Local	critical
346015	Fedora 44 : perl-Authen-SASL (2026-53e2875c88)	Nessus	Fedora Local Security Checks	Local	critical
346014	Fedora 45 : perl-Authen-SASL (2026-81cd7d0f41)	Nessus	Fedora Local Security Checks	Local	critical
343407	Linux Distros Unpatched Vulnerability : CVE-2026-86219	Nessus	Misc.	Local	critical

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